Royals fans knew they were watching a once-in-a-generation athlete. Now, ESPN’s Sport Science has weighed in, naming former two-sport superstar and Royals outfielder Bo Jackson the “Greatest Athlete of All Time”. The Sport Science study looked at many attributes, including speed, power and reaction time. Jackson earned the nod from the Sport Science panel, beating out the legendary Jim Brown.

ESPN will air a “Sport Science Greatest Athlete of All Time” special next Sunday, March 10, at 2:30 CT.

A poll is currently online at ESPN.com, with Jackson and Michael Jordan in a close race for the fan vote :